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- /* @(#)if_arp.h 1.5 88/08/19 SMI; from UCB 7.1 1/24/86 */
- /*
- * Copyright (c) 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
-
- #ifndef _net_if_arp_h
- #define _net_if_arp_h
-
- /*
- * Address Resolution Protocol.
- *
- * See RFC 826 for protocol description. ARP packets are variable
- * in size; the arphdr structure defines the fixed-length portion.
- * Protocol type values are the same as those for 10 Mb/s Ethernet.
- * It is followed by the variable-sized fields ar_sha, arp_spa,
- * arp_tha and arp_tpa in that order, according to the lengths
- * specified. Field names used correspond to RFC 826.
- */
- struct arphdr {
- u_short ar_hrd; /* format of hardware address */
- #define ARPHRD_ETHER 1 /* ethernet hardware address */
- u_short ar_pro; /* format of protocol address */
- u_char ar_hln; /* length of hardware address */
- u_char ar_pln; /* length of protocol address */
- u_short ar_op; /* one of: */
- #define ARPOP_REQUEST 1 /* request to resolve address */
- #define ARPOP_REPLY 2 /* response to previous request */
- #define REVARP_REQUEST 3 /* Reverse ARP request */
- #define REVARP_REPLY 4 /* Reverse ARP reply */
- /*
- * The remaining fields are variable in size,
- * according to the sizes above, and are defined
- * as appropriate for specific hardware/protocol
- * combinations. (E.g., see <netinet/if_ether.h>.)
- */
- #ifdef notdef
- u_char ar_sha[]; /* sender hardware address */
- u_char ar_spa[]; /* sender protocol address */
- u_char ar_tha[]; /* target hardware address */
- u_char ar_tpa[]; /* target protocol address */
- #endif notdef
- };
- #endif
-